Compilare: main.cpp: In function 'int main()': main.cpp:16:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i=1; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:21:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while(r<s.size() && s[r-l]==s[r]) r++; | ~^~~~~~~~~ main.cpp:35:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | while(r<s.size() && s[r-l]==s[r]) r++; | ~^~~~~~~~~ main.cpp:42:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for(int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:44:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | if(z[i]!=0 && i>=z[i] && i+z[i]<s.size() && z[s.size()-z[i]]==z[i]) | ~~~~~~^~~~~~~~~